Portable plant nutrient ingredient damage-free measuring apparatus and method

Abstract

The invention discloses a portable lossless measuring device of plant nutrient components and a measuring method thereof; the measuring device comprises a monochromatic source, a photoelectric detector, a light source driving circuit, a signal conditioning circuit and a microcontroller system, and the monochromatic source and the photoelectric detector form an integral vane gripper that is respectively connected with the light source driving circuit and the signal conditioning circuit through electric cables, thus not only reducing light energy loss and raising signal-to-noise ratio, but also simplifying the measuring device and leading the sampling of the gripper to be flexible and convenient; the light source driving circuit mainly comprises a voltage regulating chip, a sampling resistance, a triode and an analog switch and realizes constant-current driving of the monochromatic source and programmed adjustment of current value, thus not only improving light source stability, but also effectively solving the saturation problem of the photoelectric detector, leading the photoelectric detector to work in the best detection range, increasing the signal-to-noise ratio and raising measuring precision; furthermore, the measuring device has additional measurement and deduction of dark noise in the measuring process, thus improving the measuring precision of the plant nutrient components.

Description

technical field [0001] The invention belongs to the technical field of agriculture and forestry detection, and relates to a portable nondestructive measurement device and method for plant nutrients, in particular to the measurement of nitrogen and water content in plant leaves. Background technique [0002] Plant nutrient content is an important basis for diagnosing plant growth and nutrient supply. Non-destructive testing of plant nutrient content can be applied to plant growth evaluation, precise water and fertilizer management, variety cultivation and screening, etc., which is of great significance for precision agriculture and forestry. Nitrogen provides important support for plant photosynthesis and ecosystem productivity. It is an important nutrient for plants. Real-time monitoring of nitrogen content can accurately fertilize, promote plant growth, and help reduce environmental pollution. Water is not only an important component of the protoplasm of plant cells, but a...

AI Technical Summary

Problems solved by technology

However, the increase of neutral reference samples complicates the structure and operation of the measuring device, and the way the blade fixture is fixed to the casing makes sampling more difficult

[0005] Chinese invention patent CN1865926A discloses a portable plant leaf pigment detection device, and proposes a measurement method for chlorophyll and carotenoids, but the blade fixture of the device is connected by an optical fiber, which not only increases the complexity of the optical system of the device, but also The optical fiber will lose part of the light energy, and the optical fiber is easy to break, which brings inconvenience to the operation of the device

[0006] In addition, due to the presence of dark current, thermal noise and other noise in the photodetector and the electronic device itself after power-on, the dark noise in the measurement signal will bring certain errors to the measurement of the plant component content.

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